Flush valve



FIG. 1 is a top, front perspective view of a flush valve showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a front view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a bottom, rear perspective view thereof.

Broken lines are directed to environment and are for illustrative purposes only; broken lines form no part of the claimed design. 

CLAIM I claim the ornamental design for a flush valve, as shown and described. 